Found the problem. With this and a lot of other problems with the PC,
I finally called in Geek Squad. The tech found that my computer was
thoroughly infected. The only solution was to wipe the hard drive &
start over. It's been working perfectly since then.
HEADS UP: DO NOT download Xoftware or NoAdware. Instead of blocking
viruses, spywares, & popups, they open the computer to let them in.
Geek Squad recommends Norton Internet Security 2006 & SpySweeper.